JPS6233803B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply system for a linear motor, and in particular, it drives a running body using a propulsion coil that is divided into many sections provided on the track side, and supplies power from a commercial power source to ultra-high-speed railways, etc. The present invention relates to a power supply system for a linear motor that is suitable when a circuit system is adopted in which power is supplied to a section via a plurality of substations.

In superconducting magnetic levitation type ultra-high-speed railways, the armature coil of the linear motor (hereinafter referred to as propulsion coil) is installed on the track side for reasons such as reducing vehicle weight.
A running object such as a vehicle is driven by energizing the propulsion coil with a power conversion device on the track side.

Here, the propulsion coil on the track side is divided into sections of appropriate length in order to improve the power factor of the linear motor and reduce the capacity of the power converter, and the propulsion coil in each section is connected to a feeder section switch. It is connected to the power converter via the power converter.

The configuration is such that power is supplied only to the propulsion coils in the section where the traveling object is present via the feeding section switch.

However, when the vehicle is traveling across two districts, it is necessary to close the feeder section switches in both sections to supply power to the two propulsion coils, and in such a case, the power converter Reactive power on the power supply side increases.

Therefore, the reactive power on the power supply side of the power conversion device is generated when power is supplied to the propulsion coil by sequentially switching the feeder section switches as the vehicle travels.
It will vary depending on the number of propulsion coils that are simultaneously supplied with power.

The effect of this variation in reactive power is that when the traveling vehicle begins to enter the next section, almost only reactive power is supplied to the propulsion coil, especially when the power converter is directly connected to the commercial power source. The system that supplies power to the AC system has drawbacks such as voltage flicker, which has a significant negative impact on the AC power system, and the power supply equipment becomes oversized.

The present invention focuses on the fact that the above-mentioned reactive power fluctuation is caused by controlling the power supply to the propulsion coil while sequentially switching the feeder section switch as the traveling object advances, and the present invention provides a reactive power compensation device according to the number of traveling objects. To provide a power supply system for a linear motor configured to continuously compensate for fluctuations in reactive power on an AC input power source side by automatically switching and controlling a filter device and a filter device according to the position of a traveling body. be.

Figure 1 is a single line diagram of an embodiment of the present invention applied to a linear motor power supply system in the case of two substations per power system, in which the propulsion coils of the linear motor are connected to the propulsion coils LM ₁ to LM _on in each section. divided,
The feeders F _A1 , F A2 and F B1 , F _B2 are connected to the feeders F A1 , F _A2 and F _B1 , F B2 in sequence and repeatedly with the feeder section switches SW ₁ to SW _on , respectively, and the A group power converter CCA ₁ is connected to the feeders F _A1 and F _A2 . , CCA ₂ are feeders F _B1 , F _B2
Power converters CCB ₁ and CCB ₂ of group B are connected to the power converters CCB 1 and CCB 2 via switches SWA ₁ and SWA ₂ and SWB ₁ and SWB ₂ , respectively. In addition, section S and substation switchgear SP are installed near the middle of substation A and substation B, and depending on the position of the traveling body T, substation A or substation B is installed.
configured to operate any of the substations.

In addition, power transformers T _r1 and T _r2 are connected to the AC input power supply SS.
The power converters CCA ₁ and CCA ₂ connect to the power converters CCB ₁ and CCB ₂ via power transformers T _r3 and T _r4 .
However, a reactive power compensator RPC is also connected via a power transformer T _r5 .

Next, the operation of the single line diagram in FIG. 1 will be explained using the control circuit block diagram shown in FIG.

First, until the traveling body T reaches the position before the feeder section switch SW _o-2 is closed, the feeder section switch SW ₁ ,
The feeder section switching device SC, which instructs switching control of SW ₂ , SW _o-3 and start/stop of power converters CCA ₁ , CCA ₂ of group A, is operated by the signal from the position detector PD. Power converter CCA ₁ , CCA ₂ at output
A switching control device that operates alternately.
A gate control device TSC _A that receives the output of the SC as an input;
When the traveling body T travels across two propulsion coils by operating the reactive power compensator RPC by each output of the phase difference setting circuit PHC, or when the traveling body T is located on a specific propulsion coil. It compensates for reactive power when power is being supplied to the propulsion coil, regardless of whether the propulsion coil is powered or not.

Next, let us describe the case where the traveling body T reaches the position where the feeder section switch SW _o-2 is closed. In this case, when the feeder section switch SW _o-2 is closed, the memory circuit ME ₁ is activated. Since the output is output, the switches SWB ₁ and SWB ₂ are closed, and the gate control device TSC _B outputs the output.

When the switches SWB ₁ and SWB ₂ are closed, the power converters CCB ₁ and CCB ₂ are connected to the feeders F _B1 and F _B2 , and the gate control device TSC _B operates in a state that matches the speed of the traveling body T. so gate control device
In order to output the same output as TSC _A , the power converter
The output frequency of CCB ₁ and CCB ₂ is the power converter
It is the same as the output frequency of CCA ₁ and CCA ₂ . In this state, when the traveling body T passes through section S provided between substation A and substation B, feeders F _A1 and F _{A2 are connected to feeders F A1 and F A2} via power converters CCA ₁ and CCA ₂ ; Power converter for F _B1 and F _B2
Since power is supplied through CCB ₁ and CCB ₂ , respectively, no thrust pulsation occurs to the traveling body T.
can be operated stably. In addition, since the gate control devices TSC _A and TSC _B output similar outputs, the reactive power compensator RPC operates to prevent fluctuations in reactive power from occurring on the AC input power supply SS side. It is possible to compensate for side reactive power fluctuations.

Then, when the traveling body T reaches the position where the feeder section switch SW _o+1 is closed, the memory circuit ME ₂ outputs an output, so that the operation of the gate control device TSC _A and the power converters CCA ₁ and CCA ₂ is controlled respectively. stop it,
and the switch SWA ₁ via the first-order delay circuit A ₂ ,
Since SWA ₂ is opened, only substation B operates from this point on, and the reactive power compensator RPC operates based on the respective outputs of gate control device TSC _B and phase difference setting circuit PHC, so AC input due to load fluctuations Fluctuations in reactive power on the power supply SS side can be compensated for.

Here, the operation when a thyristor control type as shown in FIG. 3 is used as the reactive power compensator RPC will be explained based on the control circuit for the reactive power compensator shown in FIG. 4.

First, to explain the symbols in the block diagram of Fig. 4 using the waveform diagram shown in Fig. 5, VD is a voltage waveform shaping circuit that shapes the output of the voltage detector _PTr to create a rectangular wave, and ID is a current waveform shaping circuit that shapes the output of the current detector CT to create a rectangular wave, and MM ₁ and MM ₂ are one-shot circuits that do not output for a period of time t ₁ from the rising edge of the positive and negative waveforms of voltage V. , NAND ₁ , NAND ₃ are NAND circuits that output during the period of time _t1 , NAND ₂ , NAND ₄ are voltage V
AND _{10 and} AND ₂₀ are AND circuits ME ₁₀ and ME _20.
1 is a memory circuit, GDC ₁ and GDC ₂ are gate distribution circuits for the thyristor switches T ₁ to _{T 4} in the circuit diagram of FIG. Negative direction indicating circuit that issues a command when the negative direction waveform of , ST is a power conversion device
Gate start command circuit that outputs a signal synchronized with the start/stop command of CCA ₁ , CCA ₂ and CCB ₁ , CCB ₂ , PHD is a phase difference detection circuit that detects the phase difference between voltage V and current I, PHC is phase difference detection circuit phd
The phase difference setting circuit that sets the output of PHP to the phase difference reference setting PHP, CBC is the capacitor _C1 of the circuit in Figure 3.
~C ₄ capacitor bank closing command circuit that issues a command to close C4, PHL is a phase difference limiter circuit, PW
C is a phase difference width setting circuit, and V is a first-order delay circuit that delays the output of voltage detector _PTr by a certain time width.
DR ₁ and a voltage waveform shaping circuit V that shapes the output of this first-order lag circuit VDR ₁ to create a rectangular wave.
DR, AND circuit AND ₃₀ , AND ₄₀ , and NOT circuit
It consists of NOT ₄ , NOT ₅ , and NAND circuits NAND ₅ , NAND ₆ . Also, FG is a function generator, APPS
is a phase shifter, and G ₁ and G ₂ are gate circuits of the thyristor Ts. The function generator FG is composed of the circuit shown in FIG. 6, for example. That is, a NAND circuit
An operation in which the outputs of NAND ₅ and NAND ₆ are applied to an operational amplifier OP via a first-order delay circuit consisting of a resistor R ₁ and a capacitor C ₁ , and an output proportional to the time width of the output pulse of the NAND circuit NAND ₅ and NAND ₆ is output. It consists of an amplifier OP, and is set to have the characteristics shown in FIG. 7, for example.

On the other hand, the phase difference width setting circuit PWC outputs an output to operate the function generator FG when the time difference t ₂ between the voltage _V and the current I becomes shorter than the time t ₃ set by the first-order delay circuit VDR 1. Assume that the output of the function generator FG increases as the time (t ₃ −t ₂ ) increases, and the thyristor Ts is controlled according to the difference between the time t ₃ and the time t ₂ .

It is assumed that the phase difference setting circuit PHC sets the closing time of each of the thyristor switches T ₁ to _{T 4} as shown in the characteristics shown in FIG. 8, for example.

In the characteristics shown in Figure 8, 100% of the horizontal axis represents voltage V and current I.
For example, if the phase difference is 90 degrees, then 80
% is for 72 degrees, 60% is for 54 degrees, 40% is for 36 degrees, 20% is for 18 degrees, and if below 20%, capacitor C ₁
~ C ₄ shall not be input, and these set values are set by the phase difference setting circuit PHC via the phase difference reference setting circuit PHP, and the voltage V and current I of the AC input power supply SS at the time of starting the traveling body T are set. Which of the capacitors C ₁ to _{C 4} is turned on is determined by the phase difference.

That is, when the phase difference between the voltage V and the current I at the time of starting the running body T is in the range of 72 to 90 degrees, the capacitors C ₁ to _{C 4}
In the range of 54 to 72 degrees, capacitors C ₁ to C ₃ are turned on, in the range of 36 to 54 degrees, capacitors C ₁ and C ₂ are turned on, and in the range of 18 to 36 degrees, capacitor C ₁ is turned on. only will be invested.

Here, the specific circuit configuration of the phase difference reference setting circuit PHP, the phase difference setting circuit PHC, the phase difference limiter circuit PHL, and the capacitor bank input command circuit CBC is shown in FIG. In the figure, VDR ₂ to VDR ₅ that constitute the phase difference reference setting circuit PHP are first-order lag circuits that sequentially delay the output of the voltage waveform shaping circuit VD, and VDR is a waveform that converts the output of the first-order lag circuits VDR ₂ to VDR ₅ into a rectangular wave. It is a shaping circuit. Furthermore, the CNT constituting the phase difference limiter circuit PHL is a counter circuit, and is composed of, for example, 4 bits.If the output of the one-shot circuit _MM1 and the output of the phase difference detection circuit PHD of the circuit shown in FIG. 4 both become zero, This is a circuit that counts the number of output pulses that the NAND circuit NAND ₁₁ outputs during four cycles of voltage V and outputs an output according to the counted value.

Furthermore, the output terminals of AND circuits AND ₅ to AND ₈ constituting the capacitor bank input command circuit CBC are connected to the gates of thyristors T ₄ to _{T 1} shown in FIG. 3, respectively.

Next, the operation of the circuit shown in FIG. 9 will be explained using the operation waveform diagram shown in FIG. 10.

The numbers shown in parentheses in Fig. 10 correspond to the horizontal axis of the characteristic diagram shown in Fig. 8. For example, 1 in Fig. 10 is 20% in Fig. 8, 2 is 40%, and 3 is 40%.
60%, 4 is 80%.

That is, the phase difference reference setting circuit PHP is configured to issue commands to turn on the capacitors C ₁ to _{C 4} depending on the magnitude of the phase difference between the voltage V and current I on the AC input power supply SS side. nand circuit
Pulse signals with pulse widths t ₄ , t ₅ , t ₆ , and t ₇ are created using NAND ₁₀ , NAND ₉ , NAND ₈ , and NAND _{7 ,} respectively.

Now, since the time difference t ₂ between the voltage V and current I of the AC input power supply SS is larger than the pulse width t ₆ of the pulse output from the NAND circuit NAND ₈ , the AND circuit is activated.
Since outputs are output from AND ₂ to AND ₄ , the memory circuits MR ₂ to _{MR 4} store these outputs and output them at the same time. On the other hand, at this point, the counter circuit CNT is not outputting an output, so the NOT circuits NOT ₁₁ to NOT ₁₄ are outputting, and as a result, the AND circuits AND ₆ to
AND ₈ outputs and makes thyristor switches T ₁ -T ₃ of FIG. 3 conductive, and capacitors C ₁ -C ₃ are turned on.

Then, the power factor in the power supply system SS is improved by introducing capacitors _C1 to _C3 , and the time difference _t2 (hereinafter simply referred to as time difference _t2 ) between the voltage V and the current I becomes
When t becomes shorter than ₁ , at that point the NAND circuit
Since NAND ₁₁ outputs, this output pulse is counted by the counter circuit CNT and outputted to reset the memory circuit ME ₄ , the output of the AND circuit AND ₈ is made zero, and the thyristor switch T _{1 is} activated.
Disconnect capacitor _C1 from the power supply line by making it non-conductive. Since this state is within one cycle of the voltage V, the counter circuit CNT outputs only one bit, and since no output is output from the red bit, the memory circuits MR ₁ to _{MR 3} are not reset, and therefore The NOT circuits NOT ₁₁ to NOT ₁₃ continue to output.

Also, as seen from the characteristics in Figure 8, the capacitor
Since the unit capacitance of C ₁ to _{C 4} is the same, it is the same no matter which capacitor is opened.

When capacitor C ₁ is opened and the time difference t ₂ is returned between time t ₄ and time t ₅ , the counter circuit CNT still maintains its previous state, so capacitors C ₁ and C ₄ are opened. However, if the time difference t ₂ is returned between time t ₅ and time t ₆ , the AND circuits AND ₃ and AND ₄ output outputs.
_AND9 outputs an output, and the counter circuit CNT is reset by the output of memory circuit _MR5 .

If the AND circuit AND ₄ is still outputting when the counter circuit CNT is reset, the AND circuit AND ₈ outputs the output via the memory circuit ME ₄ , so the thyristor switch T ₁ becomes conductive and the capacitor C ₁ is turned on. Injected.

If the AND circuit AND ₄ does not output an output when the counter circuit CNT is reset, the AND circuit
Since AND ₈ does not output, capacitors C ₁ and C ₄ remain open.

Then, if the NAND circuit NAND ₁₁ outputs an output for three consecutive cycles including the cycle in which the NAND circuit NAND ₁₁ outputs an output, this output is counted by the counter circuit CNT and an output corresponding to that number is output, so it is stored in the memory. Since the circuits MR ₂ to MR ₄ are reset and the outputs of the NOT circuits NOT ₁₂ to NOT ₁₄ become zero, the outputs of the AND circuits AND ₆ to AND ₈ become zero and the thyristor switches T ₁ to _{T 3} become non-conductive. , and capacitors C ₁ to C ₃ are opened.

As mentioned above, the phase difference reference setting circuit PHP and the phase difference setting circuit P, which constitute the block diagram of FIG.
The operation of the circuit shown in FIG. 3 when the configuration shown in FIG. 9 is used for the HC, the phase difference limiter circuit PHL, and the capacitor bank closing command circuit CBC will be described.

First, to explain the case where the time difference t ₂ at the time of starting the running body T is in the range of time t ₇ to time t ₈ in FIG. 10, the phase difference reference value PHP is determined by the voltage waveform shaping circuit VD output As long as it's running, it's always a NAND circuit
Since NAND ₇ to NAND ₁₀ are outputting, the phase difference setting circuit PHC outputs the memory circuits ME ₁ to ME ₄ via AND circuits AND ₁ to _{AND 4} .

Therefore, in the capacitor bank closing command circuit CBC, since the AND circuits AND ₅ to _{AND 8} output, all of the thyristor switches T ₁ to T ₄ become conductive, and the capacitors C ₁ to _{C 4} are turned on.

It is assumed that when all of the capacitors C ₁ to _{C 4} are turned on when the traveling body T is started, the time difference t ₂ is improved to, for example, time t ₃ in the operating waveform diagrams of FIGS. 5 and 10. When the traveling body T is accelerated in this state, the active power increases, so when the power factor of the power supply system SS is improved and the time difference t ₂ becomes smaller than the time t ₃ , at that point the time t ₃ and the time difference t ₂ NAND circuit NAND ₅ that constitutes the phase difference width setting circuit PWC by the difference between
Since NAND ₆ outputs an output, the function generator FG outputs an output according to this output, so that the phase of the thyristor Ts is controlled.

When the phase of the thyristor Ts is controlled, the reactor L is controlled and the time difference t ₂ is returned to the time t _3. When the time difference t ₂ and the time t ₃ become equal, the function generator FG stops outputting, so the thyristor Ts becomes non-conductive. become a state. When the traveling body T is further accelerated in this state, the effective power increases, so the power factor of the power supply system SS is improved and the time difference t ₂ becomes shorter than the time t ₃ .
Even if the reactor L is controlled via the function generator FG in accordance with a command from the phase difference width setting circuit PWC, there is a possibility that the time difference t ₂ becomes shorter than the time t ₁ . Therefore, when the time difference t ₂ becomes shorter than the time t ₁ , the NAND circuit NAND ₁₁ that constitutes the phase difference limiter circuit PHL outputs an output, so the counter circuit CNT outputs an output, and this output first resets the memory circuit ME ₄ and negates it. Since the output of circuit NOT ₁₄ becomes zero, the output of AND circuit _AND8 becomes zero, so thyristor switch _T1 becomes non-conductive, and the capacitor
C ₁ is released.

When the capacitor C ₁ is opened, the time difference t ₂ becomes the time
Since it changes so that it becomes longer than t ₁ , it is safe because it does not lead to a leading power factor. Phase difference width setting circuit P.
For example, WC controls the reactor L via the function generator FG so that the time difference t ₂ does not become shorter than the time t ₁ , and when the time difference t ₂ is equal to or longer than the time t ₃ , the thyristor Ts is controlled. No phase control is performed.

Also, the phase difference limiter circuit PHL is reactor L.
When the time difference t ₂ becomes shorter than the time t ₁ when the time difference t 2 becomes shorter than the time t 1 , an output is output to instruct the capacitor bank closing command circuit CBC to open only one bank, and the phase difference limiter circuit
When the time difference t ₂ is shorter than the time t ₁ for 4 consecutive cycles including the cycle in which the PHL outputs, the attached capacitors C ₁ to _{C 4} are sequentially opened to prevent a leading power factor. It is something to be adjusted.

Further, the phase difference reference setting circuit PHP is a circuit for adjusting the input points of the capacitors C ₁ to _{C 4} to the characteristics shown in FIG. 8, for example, and the phase difference setting circuit PHP.
HC is a circuit for giving a closing command to the capacitor bank closing command circuit CBC according to the overlap between the output of the phase difference reference setting circuit PHP and the output of the phase difference detection circuit PHD.

As explained in detail above, FIGS. 1 to 10
According to an embodiment of the present invention shown in the figure, the A and B substations are automatically switched depending on the position of the traveling body, and the switch is configured so that thrust pulsation does not occur when switching between the A and B substations. Therefore, the vehicle can be operated stably.

Furthermore, in order to automatically control the reactive power compensator so that the phase difference between the voltage and current on the AC input power supply side does not lead due to the magnitude of the phase difference, the reactive power compensation device is automatically controlled to prevent reactive power fluctuations on the AC input power supply side due to load fluctuations. It is possible to sufficiently reduce the reactive power on the AC input power supply side by compensating for this.

By the way, the control circuit block diagram in FIG.
Substation switchgear SP installed in the middle of B substation
Therefore, if the traveling body T moves near the substation switchgear SP, which is far away from the A and B substations, the feeders F _A1 , F _A2 and F _B1 , F
Since the voltage drop in each of _B2 increases, problems arise such as the possibility that the traveling body T will not be operated with a predetermined thrust.

Figure 11 is a block diagram of a control circuit for operating the single line diagram in Figure ₁ to solve the _above problem. This is a wrap circuit for the A and B substations for operating the A and B substations simultaneously for a period from when the feeder section switch SW _o+2 reaches the closed position, for example.

In the same figure, AND ₁ and AND ₂ are AND circuits,
NOT is a negative circuit, and other symbols are shown using the same symbols as in the control circuit block diagram of FIG. 2, so their description will be omitted.

Next, to explain the operation of the single line diagram in Figure 1 based on the control circuit in Figure 11, when the traveling body T reaches the position where the energized section switch SW _o-4 is closed, the position detector PD The feeder section switch SW _o-4 is closed in response to a signal from the feeder section switch SW o-4, and the memory circuit ME ₁ outputs an output, so the switches SWB ₁ and SWB ₂ are closed and the gate control device TSC _B outputs an output. issue.
When the switches SWB ₁ and SWB ₂ are closed, the power converters CCB ₁ and CCB ₂ are connected to the feeders F _B1 and F _B2 , and the gate control device TSC _B is connected to the speed of the traveling body T. Since the gate control circuit works
In order to output the same output as TSC _A , the power converter
The output frequency of CCB ₁ and CCB ₂ is the power converter
It is the same as the output frequency of CCA ₁ and CCA ₂ .

In this state, when the traveling body T advances to the position where the energizing section switch SW _o-3 is closed, the memory circuit ME ₂ outputs an output. On the other hand, since the memory circuit ME ₁ has been outputting since the time when the feeder section switch SW _o-4 was closed, the AND circuit AND ₁ outputs an output.

Until the traveling body T advances to the position where the energized section switch SW _o+2 is closed, the memory circuit ME ₃ does not output an output, and therefore the first-order delay circuit A ₃ also does not output an output, so the negative circuit NOT gives an output, and the AND circuit
Since AND ₂ outputs an output, the traveling body T advances to the position where the feeder section switch SW _o-3 is closed and the period from when it reaches the position where the feeder section switch SW _o+2 is closed. is closed. Therefore, during this period, feeders F _A1 , F _A2 and F _B1 , F
_B2 is connected via the substation switchgear SP, and the power converters CCA ₁ , CCA ₂ and CCB ₁ , CCB ₂ are both operated at the same output frequency, so the feeders F _A1 , F _A2 and F _B1 , F _B2 Since the respective voltage drops are compensated for, the thrust of the traveling body T can be operated at a predetermined value.

Then, when the traveling body T reaches the position where the feeder section switch SW _o+2 is closed, a stop signal is output from the memory circuit ME ₃ , so that the power converter
The operation of each of CCA ₁ , CCA ₂ and gate control device TSC _A is stopped, and the first-order delay circuit A ₃
Since the substation switchgear SP is opened via the substation switch SP, the traveling body T runs only through the B substation after the time when the traveling body T reaches the position where the feeder section switch SW _o+2 is closed.

In other words, until the traveling body T advances to the position where the energizing section switch SW _o-3 is closed, the traveling body T is run only at the A substation, and reactive power fluctuations on the AC input power supply SS side due to load fluctuations are disabled. The power compensation device RPC compensates to reduce the reactive power on the AC input power supply SS side, and after the traveling body T advances to the position where the feeder section switch SW _o-3 is closed, the feeder section switch SW _{o+2 is closed.} During the period until the A and B substations reach the closed position, the A and B substations are operated simultaneously, the substation switchgear SP is closed, and the feeders F _A1 and F _A2 are closed.
and feeders F _B1 and F _B2 are connected to each other to compensate for each voltage drop, and the thrust of the traveling body T is operated at a predetermined value, and the voltage V and current I on the AC input power supply SS side are
Depending on the magnitude of the phase difference, the reactive power compensator
Since it controls the RPC, whether substations A and B are operated simultaneously or independently, the AC input power supply SS side is independent of the operating status of substations A and B. Reduce reactive power. On the other hand, the traveling body T is energized section switch SW _o+2
After reaching the closed position, only the B substation operates to cause the traveling body T to travel, and the reactive power compensator RPC compensates for reactive power fluctuations on the AC input power supply SS side due to load fluctuations.

As explained in detail above, when operating the single line diagram in Figure 1 using the control circuit block diagram in Figure 11, substations A and B may be operated independently or simultaneously depending on the position of the traveling body. It is controlled so that the thrust does not fluctuate due to the position of the running object, and is disabled so that this phase difference does not advance depending on the size of the phase difference between the voltage and current on the AC input power supply side. Since the power compensator is automatically controlled, it is possible to compensate for fluctuations in reactive power on the AC input power source side due to load fluctuations and to sufficiently reduce reactive power on the AC input power source side.

Figure 12 shows, for example, A and B of the single line diagram in Figure 1.
This is a block diagram of an abnormality detection device that protects healthy equipment and ensures stable operation of moving vehicles when substation A of the substations goes into an abnormal state.
_P is power converter CCA ₁ , CCA ₂ and CCB ₁ , CCB _2
1 and 2 are the absolute values of the current reference value I _P and the output current I _U , respectively _. circuit, 3 is a subtracter, 4,
6 is a first-order lag circuit, 5 is a comparator that outputs an output when the positive output of subtracter 3 (when current reference value I _P > output current I _U ) exceeds a predetermined value, and 7 is subtracter 3 A comparator that outputs an output when the output in the negative direction (current reference value I _P < output current I _U ) exceeds a predetermined value, EOR is an exclusive OR circuit, 8 is a memory circuit, and A ₃₀ is a For example, there is an abnormality detection device for one phase of the power converter CCA ₁ , _A4 is a first-order delay circuit, and other symbols are shown by the same symbols as in the control circuit block diagram of FIG. 11, so a description thereof will be omitted.

Next, to explain the operation of the block diagram in FIG. The comparator 7 outputs an output when the output is larger than the output of the absolute value circuit 2 and the deviation thereof exceeds a predetermined value. It is configured to output an output when the deviation exceeds a predetermined value.

In addition, a first-order delay circuit 6 is provided to prevent the comparator 7 from outputting due to an overshoot of the output current I _U that occurs when the current reference value I _P is switched forward or backward in the normal operating state of _the power converter CCA 1.

On the other hand, a first-order delay circuit 4 is provided to prevent the comparator 5 from outputting in a case where the current reference value I _P is given before the power converter CCA ₁ is operated.

If an abnormal condition occurs in such a state, such as a short circuit in the propulsion coil, the output current I _U will become larger than the current reference value I _P and the deviation will exceed a predetermined value, so the comparator 7 will change the output. However, this output is stored in the memory circuit 8 via the exclusive OR circuit EOR, and the output of this memory circuit 8 is used to stop the operation of the power converters CCA ₁ and CCA ₂ and also to switch the switches SWB ₁ and SWB ₂ . Closed power converter CCB ₁ ,
CCB ₂ is connected to the feeders F _B1 and F _B2 , and the substation switchgear SP is closed via the primary delay circuit _A4 to connect the feeders F _A1 and F _A2 to the feeders F _B1 and F _B2 , and the power converter is connected. Operate CCB ₁ and CCB ₂ .

In addition, after stopping the operation of the power converters CCA ₁ and CCA ₂ , the switch is connected via the primary delay circuit A ₂ .
SWA ₁ and SWA ₂ are opened in a no-current state, and the reactive power compensator RPC is connected to the power converter CCA ₁ and CCA _2.
gate control device from the time the operation is stopped.
The gate control device TSC _B interrupts the command of TSC _A.
It can be switched to be controlled by the command. (11th
Figure) As explained in detail above, when operating the single line diagram in Figure 1 using the block diagram in Figure 12, for example, an abnormal situation such as a short circuit on the load side of one group of power converters in substation A When this occurs, it is detected by the abnormality detection device, and this output is used to stop the operation of the A substation in the abnormal state, and after connecting the feeders of the two substations via the substation switchgear, the adjacent B substation is connected. The power converter that constitutes the A substation in the abnormal state is operated to continuously operate the traveling body to reduce thrust fluctuations of the traveling body, and the reactive power compensator is activated at the time when the operation of the A substation on the side of the abnormal state is stopped. Since the commands from the A substation are cut off and the control is controlled by the commands from the B substation, it is possible to continuously reduce the reactive power on the AC input power supply side.

The single line diagram in Figure 1 is an example of the case where there are two substations per power system, but Figure 13 shows the power of the linear motor when there are three substations per power system and there are two types of running bodies. This is a single line diagram of another embodiment of the present invention applied to a supply system, in which RPC ₁ and RPC ₂ are connected to AC input power source SS via power transformers T _r51 and T _r52 .
A to C are power transformers T _r1 to T _r4 and T _r6 , T _r7 and a power conversion device.
CCA ₁ , CCA ₂ , CCB ₁ , CCB ₂ and CCC ₁ , CCC ₂
and switches SWA ₁ , SWA ₂ , SWB ₁ , SWB ₂ and
Each substation consists of SWC ₁ and SWC ₂ , F _A1 , F _A2 , F _B1 , F _B2 and F _C1 , F _C2 are feeders, S ₁ and S ₂ are sections, and SW ₁ to _{SW oP} . The electric section switch, LM ₁ to LM _oP are propulsion coils, and T ₁ and T ₂ are running bodies.

Next, the operation of the single line diagram in FIG. 13 will be explained based on the control circuit shown in FIG. 14.

In the control circuit shown in FIG. 14, both traveling bodies T ₁ and T ₂ run, and traveling body T ₁ is connected to power converters CCC ₁ and CCC _{2 .}
The running body T ₂ is equipped with a power conversion device.
This figure shows a state where the vehicle is running with CCA ₁ and CCA ₂ , but only the vehicle T ₁ is running with power converters CCA 1 and CCA ₂ .
Feeding section switch when traveling by CCA ₂
SW ₁ to SW _o switching control and power conversion device CCA ₁ ,
It is assumed that the start/stop command for CCA ₂ can be issued by feeder section switching control device SC ₁ via position detector PD ₁ .

In addition, when both the traveling bodies T ₁ and T ₂ are traveling, the reactive power compensator RPC ₁ is activated according to the operating state of the traveling body T ₁ , and the reactive power compensator RPC is activated according to the operating state of the traveling body T ₂ . ₂ shall each operate.

First, until the traveling body T ₁ reaches the position before the energized section switch SW _o-1 is closed, a signal from the position detector PD ₁ can be used to control switching of the energized section switches SW ₁ to _{SW o-2} and power conversion. The feeding power classification switching _{control device SC 1 which} instructs the start and stop of the devices CCA 1 and CCA ₂ is operated, and this output is used to control the power conversion devices CCA 1 and CCA ₁ via the start command Z.
A gate control device that operates CCA ₂ alternately and uses the output of the electric section switching control device SC ₁ as input.
When the traveling body T ₁ runs astride two propulsion coils by operating the reactive power compensator RPC ₁ by the respective outputs of the TSC _A and the phase difference setting circuit PHC, or when the traveling body T ₁ runs on one propulsion coil. It compensates for reactive power when powering the propulsion coil, regardless of whether it is present on the coil or not.

Next, let us describe the case where the traveling body T ₁ reaches the position where the feeder section switch SW _o-1 is closed. In this case, when the feeder section switch SW _o-1 is closed, the memory circuit ME _{1 is} closed. outputs an output, so the switches SWB ₁ and SWB ₂ are closed, and the gate control circuit TSC _B outputs an output. Then, when the switches SWB ₁ and SWB ₂ are closed, the power converters CCB ₁ and CCB ₂ are connected to the feeders F _B1 and
Since it is connected to F _B2 , there is no thrust pulsation, so the traveling body _T1 can be operated stably.Also, since the gate control devices TSC _A and TSC _B output the same output, there is no reactive power on the AC input power supply SS side. The reactive power compensator RPC ₁ operates to prevent fluctuations.

When the traveling body T ₁ reaches the position where the feeder section switch SW _o+2 is closed, the memory circuit ME ₂ outputs an output, so that each of the gate control device TSC _A and the power converters CCA ₁ and CCA ₂ Stop the operation and switch the switch SWA ₁ through the primary delay circuit A ₂ ,
SWA ₂ is opened with no current. Therefore, from this point onwards, only substation B operates, and the gate control equipment
Since the reactive power compensator RPC ₁ is operated by the respective outputs of TSC _B and phase difference setting circuit PHC, it is possible to compensate for fluctuations in reactive power on the AC input power supply SS side due to load fluctuations.

In the case of the Tokaido Shinkansen, approximately 20 km of substation spacing is used between Tokyo and Shin-Osaka, and linear motors are used to shorten transport time, increase transport volume, and reduce noise. Even if the substation interval is 20 km, let's consider how many trainsets of linear motors will run within this substation interval.

Currently, the journey between Tokyo and Shin-Osaka is 1 hour 20 minutes (maximum speed
500Km/h, standard speed 413.5Km/h...Hikari travel time between Tokyo and Shin-Osaka and maximum speed 210Km/h
If the linear motor is operated at 6 minute intervals, the number of linear motor trains for the one-way trip between Tokyo and Shin-Osaka will be 80 minutes/6 minutes ≒ 13, so the distance between the trains will be If the distance between Tokyo and Shin-Osaka is 550Km, then 550Km/13 formations≒42.3Km, so the traveling body T ₁ ,
The location of T ₂ is as shown in Figure 13, and the 20km substation interval is covered by one linear motor train.
There will be two sets of linear motors in the three substations.

From the above, when traveling body T ₂ advances to the point where substation A operates, traveling body T ₁ uses the propulsion coil.
This is the point where the C substation is operating before the LM _op .

Next, the operation of the single line diagram in FIG. 13 after the point in time when the feeder section switch SW _op-1 of the traveling body _T1 is closed will be explained.

When the traveling body T ₁ reaches the position where the energized section switch SW _op-1 is closed, the memory circuit ME ₃ outputs an output, so the switches SWC ₁ and SWC ₂ are closed and the gate control device TSC _C outputs an output. . switch
After SWC ₁ and SWC ₂ are closed, first-order lag circuit A ₅
The power converters CCC ₁ and CCC ₂ are operated by the signal from the position detector PD _{1 via the position detector PD 1} . On the other hand, substation B has been operating since the time when the traveling body _T1 reached the position where the feeder section switch SW _o-1 was closed.
Until the traveling body T ₁ reaches the position where the feeder section switch SW _op+2 is closed, both the B substation and the C substation continue to operate, but the power converters CCB ₁ , CCB ₂ and the power converters CCC ₁ , CCC ₂ and gate control device
TSC _B and gate control device TSC _C each feed the signal from position detector PD ₁ into a section switching control device.
Since it is applied via SC ₁ , it operates in the same way, so the traveling body T ₁ is operated so that thrust pulsation does not occur, and the reactive power is compensated by the magnitude of the phase difference between voltage V and current I on the AC input power supply SS side. Since the device RPC ₁ is controlled, it is possible to compensate for reactive power fluctuations on the AC input power supply SS side due to load fluctuations.

When the traveling body T ₁ reaches the position where the feeder section switch SW _op+2 is closed, the memory circuit ME ₄ outputs an output, so that each of the power converters CCB ₁ and CCB ₂ and the gate control device TSC _B The operation is stopped and the switch is connected through the primary delay circuit A ₁ .
SWB ₁ and SWB ₂ are opened in a no-current state, and the reactive power compensator RPC ₁ is controlled by a command from the gate controller _TSC .

When the switches SWB ₁ and SWB ₂ are opened, the memory circuits ME ₁ and ME ₄ are reset, respectively.

In the block diagram of the switch SWB ₁₂ , the first-order delay circuit A ₁ , and the power converter CCB ₁₂ , the arrow pointing to the right is the command system in which the power converter CCB ₁₂ operates after the switch SWB ₁₂ is closed; The arrow indicates that switch SWB ₁₂ is activated after power converter CCB ₁₂ stops operating.
This is the command chain that opens the line.

In addition, power converter CCA ₁₂ , first-order delay circuit A ₂
In the block diagram of the switch SWA ₁₂ , the arrow pointing to the right is a command system that opens the switch SWA ₁₂ and resets the memory circuit ME ₂ after the power converter CCA ₁₂ stops operating. is the power converter after switch SWA ₁₂ is closed.
This is the command chain in which CCA ₁₂ operates.

When the traveling body T ₁ advances further than the propulsion coil LM _op+2 , the traveling body T ₁ is made to travel only at the C substation, and the traveling body
When T ₁ advances further than propulsion coil LM _op+1 , the traveling object
T ₂ is controlled by the A substation.

The traveling body T ₂ transmits the signal from the position detector PD ₂ to the power conversion device via the power section switching control device SC ₁ .
The vehicle is driven by operating CCA ₁ and CCA ₂ , and the reactive power compensator RPC ₁ is activated depending on the operating state of the traveling object T ₁ , and the reactive power compensator RPC ₂ is activated depending on the operating state of the traveling object T ₂ . Since the power converters CCA ₁₂ to CCC ₁₂ and the reactive power compensator RPC ₁₂ operate according to the positions of the traveling bodies T ₁ and T ₂ , stable operation of the traveling bodies T ₁ and T ₂ is possible. At the same time, it is possible to suppress reactive power fluctuations on the AC input power supply SS side.

The above is, for example, the first train on a one-way trip between Tokyo and Shin-Osaka.
To explain the operation of the circuit in Figure 3, there are cases where four trains are running at three substations on a round trip between Tokyo and Shin-Osaka, so if you configure the control circuit according to the number of vehicles, the Tokyo-Shin-Osaka route will be the same. The same control as in the one-way case is performed.

Furthermore, the control circuit shown in Fig. 14 has the problem of voltage drop when the traveling object passes through sections S ₁ and S ₂ , but it is possible to add the control circuit shown in Fig. 11 to the control circuit shown in Fig. 14. It is solved by

As described above in detail, according to another embodiment of the present invention shown in FIG. Since the switch is made so that thrust pulsation does not occur during switching, the running object can be operated stably, and based on the magnitude of the phase difference between the voltage and current on the AC input power supply side, the override is installed according to the number of running objects. In order to automatically control the power compensation device and to control the phase difference between the voltage and current on the AC input power supply SS side so that it does not advance, reactive power fluctuations on the AC input power supply side due to load fluctuations are compensated for and the AC input This has the effect of being able to sufficiently reduce reactive power on the power supply side.

In each of the embodiments shown in FIG. 1 and FIG. 13, harmonic current flows out to the AC input power source side when the power converter is in operation, but countermeasures against this will be described below.

When power is supplied directly from a commercial frequency AC power source to the propulsion coil via a power conversion device, the current on the AC input power source side is amplitude-modulated by the output current of the power conversion device, and in addition to the fundamental wave, fractional harmonics and their side bands are generated. It is well known that many harmonic currents such as waves are generated, and if a filter device is not installed, many of these harmonic currents will flow into the AC input power supply, causing inductive disturbances in communication lines etc. Such problems arise. The frequency _h of the harmonic current flowing into the AC input power source during operation of the power converter is generally expressed as follows. That is, _h = _{k i} ±2 _{o p} ...... (1) where, _i : power supply frequency _p : output frequency k: 1 and 6 m ± 1, m = 1, 2, ...... n: 0, 1, 2,...... When the power converter operates, as is known from the second term on the right side of equation (1), harmonics of irregular orders of the power supply frequency appear, and the output frequency _p changes depending on the speed of the traveling object, so the frequency spectrum of the harmonics It is necessary to consider that it changes continuously.

If the current with the harmonic frequency _h in equation (1) flows into the AC input power supply side when the power converter is operating, an inductive disturbance will occur in the communication line, etc., and the equivalent disturbance shown in the following equation is used as a relational equation to study this problem. A current J _P is used. i.e. Here, S _o : Noise evaluation coefficient of voltage at frequency _o I _o : Current component at frequency _o .

That is, a fault caused by a harmonic current on the AC input power supply side that occurs when the power conversion device operates is evaluated by the equivalent disturbance current _JP .

The equivalent disturbance current J _P was calculated by analyzing the frequency spectrum of continuous harmonics from the current waveform on the AC input power supply side of the power converter during power running of the power converter, which was actually measured while keeping the measured current reference value J _P constant. As a result, as shown in FIG. 15, the characteristic is large in the low speed range and high speed range, and minimum in the medium speed range. Here, the reason why the equivalent disturbance current J _P becomes large in the low speed range is that the back electromotive force of the linear motor is small, so the current supplied from the AC input power supply to the power converter increases, and the harmonics of each order increase accordingly. This is because the wave current has become larger, and the reason why the equivalent disturbance current _JP has become larger in the high-speed range is that the sideband currents of the fundamental frequency _p and integer harmonics have become larger due to the influence of the back electromotive force of the linear motor. This is because of this. In order to reduce the current at the harmonic frequency _h shown in equation (1), it is necessary to connect a filter device such as the one shown in Figure 16, which is used in DC transmission systems, to the AC input power source. , with the characteristics shown in Figure 15, it is the first in the entire speed range of the linear motor.
If the filter device shown in Fig. 6 is kept connected, problems such as overcompensation will occur.

A specific embodiment for solving this problem is shown in FIG. 17. For example, a plurality of the circuits shown in FIG. 16 are used as the filter devices FL ₁ and FL ₂ , and the on/off control of these circuits is, for example, The control circuit block diagram shown in FIG. 18 is used.

FIG. 18 shows a control circuit for on/off control of the filter device FL ₁ , in which the filter is controlled by the harmonic current setting device FL ₁₀ which receives the magnitude of the current reference value I _P and the speed v of the traveling body T ₁ as input. The device FL ₁ is operated and controlled to satisfy the characteristics shown in Fig. 15, and the block diagram of the harmonic current setting device FL ₁₀ shows the current setting value I _f1 that can drive the linear motor, and the linear motor The current setting value I _f2 is approximately 50% of the rated current, and the current setting value I _f3 is approximately 50% of the rated current of the linear motor.The current setting value I f2 is approximately 50% of the rated current, and the current setting value I _f3 is approximately ₅₀ % of the rated current of the linear motor. It generates a command to reduce harmonic current.

The selection of each of FL ₁₁ to _{FL 13} is performed, for example, by the logical sum circuit OR ₃ that outputs an output regardless of the magnitude of the current setting value and the traveling speed of the traveling body T ₁ in the low speed range or high speed range, and the logical product circuit
When any one of G ₁₁ to G ₁₃ outputs the switch
Since one of S ₁₁ to S ₁₃ is closed, FL ₁₁
~FL ₁₃ is connected to the AC input power supply SS, thereby reducing harmonic current of the AC input power supply SS.

If a block diagram similar to that shown in FIG. 17 is used for the on/off control of the filter device _FL2 , the same on/off control as that of the filter device _FL1 is performed.

That is, the harmonic current of the AC input power source can be reduced by installing filter devices corresponding to the number of running bodies as shown in FIG. 17, and controlling the on/off of these filter devices according to the block diagram shown in FIG. Since this is carried out according to the speed of the traveling object and the magnitude of the current reference value, the characteristics shown in FIG. 11 can be satisfied, and the entire device can be made smaller.

In addition, in the embodiment shown in FIG. 17, the harmonic current of the AC input power supply SS is reduced to some extent by the reactive power compensators RPC ₁ and RPC ₂ , so the filter device
Both FL ₁ and FL ₂ can be made smaller to some extent.

FIG. 18 is a block diagram of a control circuit that controls on/off of the filter devices FL ₁ and FL ₂ in the single line diagram of FIG. 17 according to the speed of the traveling object and the magnitude of the current reference value. is a circuit diagram in which a block diagram of a control circuit for controlling on/off of each of the filter devices FL ₁ and FL ₂ according to the position of the traveling body is added to the control circuit block diagram of FIG. 14, but the harmonic current setting device The block diagram shown in FIG. 18 shall be used for FL ₁₀ and FL ₂₀ . The symbols in the block diagram of FIG. 19 are the same as those in the block diagrams of FIGS. 14 and 18, so the explanation will be omitted.

Next, the operation of the single line diagram in FIG. 17 will be explained based on FIGS. 18 and 19.
Reactive power compensators RPC ₁ , RPC ₂ and filter device FL ₁ for each position change of T ₁ , T ₂ ,
Each operation of FL ₂ is based on the block diagram in Figure 14 and the single line diagram in Figure 13 of the reactive power compensator.
A filter device which operates similarly to each of RPC ₁ and RPC ₂ and corresponds to each change in the speed and current reference value I _P of the traveling bodies T ₁ and T ₂ .
Since the ON/OFF control of each of FL ₁ and FL ₂ is the same as the control method according to the block diagram of FIG.
Since the single line diagram in FIG. 17 operates in the same manner as explained using the single line diagram in the figure, the explanation of the operation will be omitted.

As described above, according to another embodiment of the present invention shown in FIG. Switching is performed so that pulsation does not occur, allowing stable operation of the vehicle.

In addition, based on the magnitude of the phase difference between the voltage and current on the AC input power supply side, the reactive power compensator installed according to the number of running objects is automatically controlled and the phase difference is prevented from advancing. Because of this control, reactive power fluctuations on the AC input power source side due to load fluctuations can be compensated for and reactive power on the AC input power source side can be sufficiently reduced.

Furthermore, the filter devices installed according to the number of moving objects can be automatically turned on and off according to the speed of the moving objects and the magnitude of the current reference value, making it possible to sufficiently reduce harmonic current on the AC input power source side. There are effects such as

As described in detail above, according to the present invention, regardless of the normal or abnormal state of the power conversion device and its load side, electric power is This has the effect of reducing the reactive power and harmonic current on the AC input power source side when the converter is in operation, and also compensating for their fluctuations.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a power supply system for a linear motor embodying the present invention, Figure 2 is a block diagram showing the configuration of a control circuit for operating the power supply system shown in Figure 1, and Figure 3 is a block diagram showing the configuration of a control circuit for operating the power supply system shown in Figure 1. A circuit diagram showing an example of a reactive power compensator, FIG. 4 is a block diagram showing the configuration of a control circuit for operating the reactive power compensator of FIG. 3, and FIG. 5 shows each part of the control circuit of FIG. 6 is a circuit diagram showing the specific configuration of the function generator, FIG. 7 is a diagram showing an example of the characteristics of the function generator, FIG. 8 is a diagram showing an example of the characteristics of the phase difference setting circuit, and FIG. FIG. 9 is a circuit diagram showing the specific configuration of the phase difference reference setting circuit, phase difference width setting circuit, and phase difference limiter circuit, FIG. 10 is an operation waveform diagram of each part of the circuit shown in FIG. 9, and FIG. FIG. 12 is a block diagram showing the configuration of another control circuit for operating the power supply system shown in FIG. 14 is a block diagram showing the configuration of a control circuit for operating the configuration diagram of FIG. 13, and FIG. 15 is a block diagram of a power supply system for a linear motor showing another embodiment of the present invention. Actual measurement characteristic diagram of equivalent disturbance current with respect to value change, No. 16
The figure is a circuit diagram showing the configuration of a conventionally used filter for reducing low-order and high-order harmonic currents, No. 17.
The figure is a configuration diagram of a power supply system for a linear motor showing another embodiment of the present invention, and FIG. Figure 19 is a block diagram showing the configuration of the wave current setting device.
8 is a block diagram showing the configuration of a control circuit for operating the power supply system shown in FIG. 7. FIG. A to C...Each substation, A ₁₀ ...A, B substation switching circuit, A ₂₀ ...A, B substation wrap circuit, A ₃₀
... Abnormality detection device, A ₄₀ , A ₅₀ ... A to C substation switching circuit, CCA ₁ , CCA ₂ ... Power conversion device of A substation, CCB ₁ , CCB ₂ ... Power conversion device of B substation , CCC ₁ , CCC ₂ ... Power conversion device of C substation, FL ₁ , FL ₂ ... Filter device, FL ₁₀ , FL ₂₀ ...
...Harmonic current setting device, F _A1 ~ F _C1 , F _A2 ~ F _C2
...Feeder, I _P ...Current reference value, LM ₁ ~ LM _oP
...propulsion coil, RPC ₁ , RPC ₂ ... reactive power compensator, SP ₁ , SP ₂ ... substation switchgear, SWA ₁ ,
SWA ₂ ... Switches for power converters CCA ₁ and CCA ₂ ,
SWB ₁ , SWB ₂ ...Switches of power converters CCB ₁ , CCB ₂ , SWC ₁ , SWC ₂ ...Power converters CCC ₁ ,
CCC ₂ switch, SW ₁ ~ _{SW oP} ... Feeding section switch, T ₁ , T ₂ ... Traveling body, PD ₁ , PD ₂ ... Traveling body
T ₁ , T ₂ position detector, SC ₁ , SC ₂ ... Feeding section switching control device, TSC _A to TSC _C ... Gate control device, PHD ... Phase difference detection circuit.

Claims (1)

[Claims] 1. An AC input power source, a plurality of power conversion devices operated in parallel in response to the output of the AC input power source, and a plurality of switches provided between the power conversion devices and the feeder. A plurality of power substations configured,
A multi-section propulsion coil installed on the track side, a switch group provided between the propulsion coil and the feeder, and switching control of the switch group in sequence according to the traveling position of the traveling object, and the electric power In a linear motor power supply system comprising a control means for controlling the opening and closing of a plurality of switching paths of a substation, a plurality of reactive power compensators are provided in the AC input power source according to the number of the running bodies, and the control means The means specifies a reactive power compensator to be operated by a control signal for controlling opening/closing of a plurality of switches of the power substation, and the control section of the reactive power compensator is specified by the voltage and current level of the AC input power source. A power supply system for a linear motor, characterized in that the power supply system is configured to be set according to a phase difference. 2. A plurality of power sources including an AC input power source, a plurality of power conversion devices operated in parallel in response to the output of the AC input power source, and a plurality of switches provided between the power conversion device and the feeder. substation and
A multi-section propulsion coil installed on the track side, a switch group provided between the propulsion coil and the feeder, and switching control of the switch group in sequence according to the traveling position of the traveling object, and the electric power In a linear motor power supply system comprising a control means for controlling opening and closing of a plurality of switches of a substation, a plurality of reactive power compensators are provided in the AC input power source according to the number of the running bodies, and a plurality of reactive power compensators are provided in the AC input power source according to the number of the running bodies A switching device for switching the feeder is provided at a boundary point of a power supply section shared by two adjacent power substations among the power substations, and the control means is controlled to open and close a plurality of switches of the power substation. A reactive power compensator to be operated is specified by the signal, and a control section of the reactive power compensator is set according to the phase difference between the voltage and current of the AC input power source, and the traveling object enters the vicinity of the switchgear. When the switching device opens the circuit and simultaneously outputs a control signal for simultaneously operating the two adjacent power substations and a control signal for specifying the number of reactive power compensators to be operated among the plurality of reactive power compensators. A power supply system for a linear motor characterized by the following configuration. 3 A plurality of power sources including an AC input power source, a plurality of power conversion devices operated in parallel in response to the output of the AC input power source, and a plurality of switches provided between the power conversion device and the feeder. substation and
A multi-section propulsion coil installed on the track side, a switch group provided between the propulsion coil and the feeder, and switching control of the switch group in sequence according to the traveling position of the traveling object, and the electric power In a linear motor power supply system comprising a control means for controlling opening and closing of a plurality of switches of a substation, a plurality of reactive power compensators are provided in the AC input power source according to the number of the running bodies, and a plurality of reactive power compensators are provided in the AC input power source according to the number of the running bodies A switching device for switching the feeder is provided at a boundary point of a power supply section shared by two adjacent power substations among the power substations, and the control means is controlled to open and close a plurality of switches of the power substation. A reactive power compensator to be operated is specified by a signal, a controlled section of the reactive power compensator is set according to a voltage of the AC input power source, a phase difference of current, and an output current of the power converter is controlled. When the deviation between the current command and the output current exceeds a predetermined value, a switch provided between the corresponding power converter and the feeder is opened, and a switch adjacent to the corresponding power converter is opened. A linear motor characterized in that it is configured to close a switching path provided between a normal power conversion device and a feeder, then close the switching device, and then operate the normal power conversion device. power supply system. 4 A plurality of power sources including an AC input power source, a plurality of power conversion devices operated in parallel in response to the output of the AC input power source, and a plurality of switches provided between the power conversion device and the feeder. substation and
A multi-section propulsion coil installed on the track side, a switch group provided between the propulsion coil and the feeder, and switching control of the switch group in sequence according to the traveling position of the traveling object, and the electric power In a linear motor power supply system comprising a control means for controlling opening and closing of a plurality of switches in a substation, a plurality of reactive power compensators and a plurality of filter devices are connected to the AC input power source according to the number of the running bodies. At the same time, the control means simultaneously specifies a plurality of reactive power compensators and filter devices to be operated based on a control signal for controlling opening/closing of a plurality of switches in the plurality of power substations; The control section of the reactive power compensator is set according to the phase difference between the voltage and current of the AC input power source, and a current command signal is set for controlling the speed of the traveling object and the output current of the power converter. A power supply system for a linear motor, characterized in that the power supply system for a linear motor is configured to designate a section to be inputted in the designated filter device according to the size.